FIGURE 8.

Effects of N-deficient growth conditions on wheat stem rust disease. Schematic diagram showing plant growth conditions for testing N effects on stem rust disease. Four-week-old LC seedling was inoculated with Pgt (A). Photograph of uredinia growth in the leaves of LC grown on ${\mathrm{NH}}_{\mathrm{4}}^{\mathrm{+}}$-supplied (left panel) or N-free media (right panel). Bar = 1 cm (B). Disease class standards were calculated following the international standard for wheat stem rust disease corresponding to the phenotypes shown in (B,C). Significant differences were analyzed (^∗P < 0.05).